Well long story short, after modifying a rally clio with a worked head and some 428s ive bent 2 sets of valves (had to change piston once) and i just cant figure out why since it they broke at high and very low rpms.
Now that it has a new vvt pulley in and they broke again im running out of options, i bough the car used as a group N Clio and im thinking the head was previously milled (cheating), and now we have overlap issues, the strange thing is that it doesnt happen right away, it once did it at idle, then it happened in after 15 minutes of intense testing in a tarmac stage.
AFAIK the 428 run on stock valve springs, retainers etc right?
Now that it has a new vvt pulley in and they broke again im running out of options, i bough the car used as a group N Clio and im thinking the head was previously milled (cheating), and now we have overlap issues, the strange thing is that it doesnt happen right away, it once did it at idle, then it happened in after 15 minutes of intense testing in a tarmac stage.
AFAIK the 428 run on stock valve springs, retainers etc right?